DUAL POWER PCMCIA CARD DESIGN
Original Publication Date: 1997-Sep-01
Included in the Prior Art Database: 2002-Jun-07
PCMCIA cards have emerged as the defacto standard package for modular computer memory, modems, and other related devices. As a result, few laptop or notebook computers built today lack a PCMCIA port and most actually support multiple cards. The governing document for these cards-the PC Card Interface Standard--defines several physi- cal and electrical parameters required to insure compatibility between a wide range of cards and hosts. While the electrical interface requirements are the same for all cards, there are several allow- able physical designs referred to as Type 1, Type II, and Type 111. Each have different dimensions but utilize a common connector interface. As it turns out, two of the smaller Type II cards tit within the volume of a Type III slot, a fact which has lead many host device manufacturers to build "comhina- tion" PCMCIA ports which allow either a Type 111 card or two Type II cards to be used interchange- ably (with one of the Type II cards using the same connector receptacle occupied by the Type 111 card in the latter configuration). This design has likewise become the standard configuration for multiple PCMCIA port products, including most portable computers.